There\’s a very, very, simple solution to this:
Prisoners paid £3 a day to work at call centre that has fired other staff
The reason you don\’t pay prisoners more than this is because you don\’t want prisoners, even in an open prison, swanning around with £200 a week in their pockets.
But if you\’re going to employ them, outside the prison then you also don\’t want them being hired out at £3 a day. For the obvious undercutting reasons (although there is a good argument that training and rehabilitation are a good idea for them and thus justify low wages).
The answer being: they can earn £3 a day, just as much as they would in jobs inside the prison. But they should be paid more normal rates. To be collected upon their release from an escrow account.
And wouldn\’t that be a good idea, that a prisoner leaves with a little nest egg to get them started?